Design for a gem crown



FIG. 1 is a top view thereof;

FIG. 2 is a front elevational view thereof, the rear elevational viewbeing identical to the front view; and,

FIG. 3 is left elevational view thereof, the right elevational viewthereof being identical to the left elevational view.

The broken lines are devoted to environment and are for illustrativepurposes only; the broken lines form no part of the claimed design.

The ornamental design for a design for a gem crown, as shown anddescribed.